"Another scheme threatens the user with arrest or prosecution because child pornography or other objectionable material has been found on the machine. The user can make this go away by paying a fine.
I think it was the result of clicking on a link from an email. She's quite gullible when it comes that sort of stuff. Shortly after I fixed that issue, she got another one. This one was in the form of a screen that appeared upon boot-up. It was designed to look like the home page of Homeland Security. Scary as hell if you're a computer novice. It even activated the laptop's web cam and had a small window that showed the user's image, real time!